in·sane 
(ĭn-sān)
(ĭn-sān)adj.
1.
a. Of, exhibiting, or afflicted with mental derangement. Not used in psychiatric diagnosis.
b. Characteristic of or associated with persons who are mentally deranged: an insane laugh; insane babbling.
c. Intended for use by such persons: an insane asylum.
2. Having been determined to be in a condition that meets the legal definition of insanity.
3. Immoderate; wild: insane jealousy.
4. Very foolish; absurd: took insane risks behind the wheel.
[Latin īnsānus : in-, not; see IN-1 + sānus, sane, healthy.]
in·sanely adv.
in·saneness n.